It takes a few months to get existing flies under control, but once we did that, they work great. We have almost no flies in the barn area. We double up in the worst summer months, and actually, spalding GIVES us the free bonus if we pay for 6 months in advance.
Can't say enough about these little flies. They don't bother people or animals either it's true. The only bad thing I can say is that if you don't get them out of your mailbox fast enough, fire ants may get to them. That and the package might stink a bit, but nothing I won't deal with to keep the pest flies away!
